A car battery serves as a critical component in a vehicle's electrical system, providing the necessary power to start the engine and supply electricity to the various electrical components when the engine is not running. A car battery is a type of rechargeable energy storage device known as a lead-acid battery. It works through a chemical reaction that involves the movement of electrons between different materials within the battery. It's important to note that a car battery has a limited lifespan and will eventually lose its ability to hold a charge effectively. Regular maintenance, such as checking the battery's terminals and ensuring proper charging, can help extend its life. If a battery fails, the vehicle may not start, and electrical systems may not function correctly.